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A man who shot his son and his son's mother is dead after turning the gun on himself. Tyrell Styles of Delaware County was cornered by police before pulling the trigger. (Published Monday, Jul 28, 2014)

Updated at 10:08 AM EDT on Monday, Jul 28, 2014

A Philadelphia man is dead after police say he shot and killed his son, critically injured his girlfriend and then turned the gun on himself.

Investigators say 26-year-old Shyema Washington and her 5-year-old son were attending a family member's birthday party at an apartment complex on the 1100 block of Haverford Road in Ridley Township Saturday night.

Police say the boy's father and Washington's boyfriend Tyrell Styles, 26, of Philadelphia arrived at the party to pick up his son around 11:30 p.m. Washington went inside the apartment to get her son, according to investigators. When she came back outside, Styles allegedly pulled out a Ruger 9 mm and opened fire.

Washington was struck once in the mouth, twice in the buttocks and once in the midsection. Styles then allegedly pointed the gun at his own son and fired two shots. The boy was struck once in the forehead and once in the ankle. Styles then fled the scene in a white Pontiac Grand Prix, according to police.

Father Kills Son, Wounds Mother

A Delco father killed his son and wounded the mother before attempting to take his own life on Sunday. (Published Monday, Jul 28, 2014)

Responding officers chased after Styles, leading to a collision on Chester Pike and Oak Avenue in which two other drivers suffered minor injuries. Police say Styles continued to drive off until he arrived at a dead end on the 300 block of Brainerd Boulevard in Sharon Hill. As officers got out of their cars to approach him, investigators say Styles turned the gun on himself and fired one shot.

The 5-year-old boy was taken to Crozer-Chester Medical Center where he was later pronounced dead. Washington was also taken to Crozer-Chester where she is currently in critical condition.